PHYSICS 100A
Sheet
Experiment 7
Data
DATA from TRACKER (Be sure to include units where needed)
Surface: ___Wood Floor_________
Bounce
Speed before
bounce, 𝑣𝑖
Speed after
bounce, 𝑣𝑓
1
Ball 1: ___Tennis Ball___________
2
3
1.576 m/s
2.542 m/s
1.979 m/s
1.440 m/s
1.728 m/s
1.880 /s
Record heights
ℎ0
1.586 m
ℎ1
0.983 m
ℎ2
0.652 m
ℎ3
0.502 m
Ball 2: ___Ping Pong Ball _______
Bounce
Speed before
bounce, 𝑣𝑖
Speed after
bounce, 𝑣𝑓
1
1.344 m/s
2
0.1764 m/s
3
0.1801 m/s
0.2408 m/s
0.1886m/s
0.1862 m/s
ℎ0
1.352
ℎ1
0.875 m
ℎ2
0.630 m
ℎ3
0.508 m
Ball 3: __White Marble_______
Bounce
Speed before
bounce, 𝑣𝑖
1
1.483 m/s
2
3
0.0993 m/s
0.1006 m/s
Speed after
bounce, 𝑣𝑓
0.1220 m/s
ℎ0
1.484 m
0.1308 m/s
ℎ1
0.472
0.06718 m/s
ℎ2
ℎ3
0.242
0.121 m
Different Surface ____Carpet______ with Ball __Tennis Ball_______
Bounce
Speed before
bounce, 𝑣𝑖
Speed after
bounce, 𝑣𝑓
1
2
3
1.483 m/s
0.2067 m/s
0.1932 m/s
0.3578 m/s
0.2484 m/s
0.1771 m/s
ℎ0
1.483 m
ℎ1
0.719
ℎ2
ℎ3
0.343 m
0.1715 m
CALCULATIONS
Ratio of Speeds
𝐶𝑅 values
Ball 1
Ball 2
Ball 3
Speeds from
Bounce 1
Speeds from
Bounce 2
Speeds from
Bounce 3
0.7043 m/s
0.1791 m/s
0.0822 m/s
Different
Surface
0.2412 m/s
0.6797 m/s
1.0691 m/s
1.3172 m/s
1.2017 m/s
0.9449 m/s
1.0338 m/s
0.6677 m/s
0.9166 m/s
Root of Ratio of Heights
𝐶𝑅 values
Ball 1
Ball 2
Ball 3
Heights from
Bounce 1
Heights from
Bounce 2
Heights from
Bounce 3
0.7872 m
0.8045 m
0.5639 m
Different
Surface
0.6962 m
0.8144 m
0.8485 m
0.7160 m
0.6406 m
0.8744 m
0.8979 m
0.7071 m
0.7071 m
Questions:
1. Examine your values for both methods. (speeds and heights). Does one set of
measurements give a more consistent value of the coefficient or restitution?
Explain.
a. After examining values for both methods, it was evident that the
coefficient restation values were more consistent. This is because the
square root of the ratio produces for accurate and consistent values.
2. Are any of the values you obtained for the Coefficient of Restitution greater
than one? What does this mean? Is this reasonable to expect?
a. Yes, there are a few values obtained for the coefficient of restitution that
are above a value of 1. This means that the kinetic energy has increased
prior to collision.
TRACKER SHOTS. Include the tracker shots of the 4 bounces here. Give the
name of each person who analyzed that video.
Wood Floor
Tennis Ball
Ping Bong Ball
White Marble
Carpet
Tennis Ball